Mold for curved pipe-sections.



w. s. SIGLBR. MOLD FOB GURVED RIPE SECTIONS:

APPLICATION FILED NOV. 2, 1908.

938,024. Patented.0ct.26,1909.

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PATENT OFFICE.

WINFIELD STEINER'SIGLER, OF MEXICO, MEXICO.

MOLD FOR CURVED PIPE-SECTIONS.

Application filed November 2, 1908.

To all whom it may concern:

Be it known that I, IVINFIELD STEINER SIGLER, citizen of the UnitedStates of America, residing at Avenida 15, San Pedro, Mexico D. F.,Mexico, have invented certain new and useful Improvements in Molds forCurved Pipe-Sections, of which the following is a specification.

My invention relates to molds for forming curved sections of pipes madeof concrete, cement, clay, asphaltum or bitumen or any material whichwill become plastic under conditions of mixture with water or of beingheated and become solid under normal conditions of temperature andmoisture.

The purpose is to provide a mold having a corepiece readily collapsiblefrom its normal active periphery for insertion into and extraction fromthe mold, with means to expand it to its proper shape and periphery.

Whereas a mold and core similar to those here described with suitablemodifications as to curvature are advantageously applicable to formingstraight pipe-sections this in vention is of especial value in formingcurved sections as the withdrawal of the core in such cases presentsespecial difliculties.

These objects I attain by the constructions illustrated in theaccompanying drawing, in

Figure 1., is a perspective view of my mold box ready for receivingmaterial for making the requisite section; Fig, 2. a view of one half ofthe mold showing the core in position, Fig, 3. a perspective view of thecore expanded to its normal diameter; F ig., 4. a perspective view ofthe core in a collapsed or closed position; F ig., 5. a perspective viewof the wedge used to expand the core; F ig., 6. a perspective view ofthe tool for extracting the wedge from the expanded core; and Fig, 7 isan elevation of the conical cap over the core.

In all the views identical reference symbols denote identical parts.

The mold box A, preferably made of wood is made up of the two halfsections 1l each containing a recess B, axially curved to correspond tothe curve of the desired pipe section and having a semicircular sectionat any point when out by a plane normal to the longitudinal curvature atthat point.

The bottom of the mold is closed by the annular shelf C, projectinginwardly and Specification of Letters Patent.

Patented Oct. 26, 1909. Serial No. 460,770.

horizontally, and tightly inclosing the bottom of the core 3. The twohalves are locked together by hinged hasps and staples 2, or by anyother suitable means forming a curved cylindrical hollow of the diameterof the outside of the pipe. The core 3 preferably made of wood may bedescribed as an corresponding to the curvature of the pipe and of adiameter equal to the internal diameter of said pipe. This core is cutinto two equal halves 3 3*, along the diameter 3", Fig. 4, which partsare joined at one side of the core by the hinge 3. On the sidediametrically opposite to said hinge there is cut out from the face ofthe cylindrical sectioned core as originally made a wedge 3, extendingthe length of the core conforming to its curvature and having arectangular section with exception of the curved outer side and taperingin circumferential width as it approaches the bottom of the core, andthere is also out enough from each inner face of said core halves toleave the hollow space I 8, extending throughout the length of the Icore of ungnlar cross section. When the space 3 is filled by the wedge6, the core is expanded to its normal diameter as in Fig. 3, but whenthe wedge is withdrawn the two [halves collapse to form a core piece nor longer of circular section and of reduced cross section as in Fig. 4,which enables it t to be readily entered into and withdrawn from themoldbox A.

In molding, the box A, is closed and locked, the core 3, expanded to itsfull diameter by insertion of the wedge 6, is inserted in place so thatits sides are at all points at an equal distance from the inner sides ofthe mold, the top of the core and the upper entrance to the ungularspace 8, l are covered by the conical cap 4, the sloping sides of whichguide any stray material into the mold groove to be filled; concrete,cement or whatever the pipe material may be is poured into the moldcompletely filling the same. The cap 4, has a flat bottom from whichproject two pins 5 engaging in coriresponding holes in the top of thecore, whereby its two halves are held together. I After the material hasbecome sufficiently hard the mold is readily withdrawn by unlocking thehasps 2, and. taking away the j mold section. The conical cap 4, istaken ofi the core and the wedge 6, extracted j therefrom by insertingthe hook 9, at the I axially curved cylinder, said axial curvature I endof lever 7 under the shoulder 10 of said wedge, operating through theungular space 8 on each side of which rests the fulcrum piece 11 and bybearing down on said lever. The wedge extracted, the core at oncecollapses and can readily be withdrawn from the now completed pipe.

I recognize that many different devices based on the above specifiedfeatures of construction can be used to facilitate the molding ofconcrete pipes, but I have here inclicated only the device which to meseems most adequate for the purpose without prejudicing my claim to anymodification coming within the scope of the herein expressed inventiveidea.

I claim:

} A mold for pipes having a female portion consisting of two halves withmeans for locking them together, containing a cylindrical hollow spaceof a diameter and curvature corresponding to the desired curvature ofthe pipe and closed at the bottom by an annular shelf and a core of saidcurvature and normally of the diameter of the inside of said pipe, beingmade in two originally semi-cylindrical halves, hinged together at oneside, each having its inner face cut away in the completed core at ataper increasing from said hinged side along the diameter of section andterminating at the opposite side in a downwardly tapering recess ofrectangular section excepting as to its peripheral side, a wedge driveninto said recess having a peripheral side exactly piecing out theperipheral sides of said halves, the surface of said core being of adiameter equal to the inner diameter of said pipe, the inner faces ofsaid halves forming with the back 7 of said wedge an opening of ungularsection extending from the top to the bottom of said core and covered ontop when the material is put into the mold by a conical cover having aflat bottom with means for securingit to the top face of said core forholding its said two halves together.

In testimony whereof I aflix my signature in presence of two witnesses.

' VINFIELD STEINER STGLER. WVitnesses J. GRANDJEAN, Josii MATA.

